The product is an original GM crankshaft pulley specifically designed for 1964-1968 Chevrolet GM cars with a 327 small block engine. The pulley features a 2 groove design and is identified by GM part number 3744043. It is a genuine replacement part made by GM, ensuring a perfect fit and quality construction for your vehicle. With this crankshaft pulley, you can trust that your engine's performance will not be compromised, and that your vehicle will run smoothly and efficiently. #6118MPULLEY